The Unknown (Animorphs #14) by Katherine Applegate

https://thebookvoice.com/podcasts/2/audible/101706 to listen full audiobooks. Title: The Unknown (Animorphs #14) Series: Animorphs, Book 14 Author: Katherine Applegate Narrator: Sisi Aisha Johnson Format: mp3 Length: 3 hrs and 33 mins Release date: 02-02-21 Ratings: 5 out of 5 stars, 104 ratings Genres: Science Fiction Publisher's Summary: There's a new rumor in town. Someone has discovered an item that proves life on other planets exists, and they've been hiding it on a base called Zone 91, the most secret place on Earth. Cassie and the other Animorphs already know about life on other planets. Too well. Their enemies the Yeerks will try to access Zone 91, to find out if what's there will threaten their mission to conquer to the planet. So the Animorphs decide to pay Zone 91 and the Yeerks a little visit. But what they discover is not at all what they expect.